Tool-holder for grindstones



2 Sh eets-Sheet 1.

J. R. HAMILTON. TOOL HOLDER POR-GRIND'STONES.

(No Model.)

Patent-ed Mar. 8, 1887.

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(No Model.) 2 SheetsSheet '2.

' J. R. HAMILTON.

TOOL HOLDER FOR GRINDSTONES.

N0. 359,151. Patented Mar. 8-, 1887.

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NITED STATES PATENT OFFICE.

JONATHAN R. HAMILTON, OF MINNEAPOLIS, MINNESOTA.

TOOL-HOLDER FOR GRINDSTONES.

SPECIFICATION forming part of Letters Patent No. 359,151, dated March 8,1887.

Application filed June 21,1886. Serial No. 205,804. (No modch) atMinneapolis, in the county of Hennepin and State ofMinnesota, haveinvented certain new and useful Improvements in Tool and ImplementHolders for Grindstones, of which the following isaspecification,reference being had therein to the accompanying drawings.

This invention relates to certain improvements in devices for supportingand holding the knives of reapers, mowers, and the like, and adjustingthem in proper position with respect to the grindstone while beingground,

U as more fully hereinafter specified; and it has for its objects toprovide an attachment which may be secured to the bed of the grindstone,and which is provided with suitable adj ustable devices for clamping theknives and presenting the same conveniently and without trouble at anydesired angle to the stone, as more fully hereinafter specified. Theseobjects I attain by the means illustrated in the accompanying drawings,in which- Figure 1 represents a perspective view Show ing one form of myimproved attachment; Fig. 2, a front elevation of a portion of thedevice in detail; Fig. 3, a perspective view of a modification of myimproved device; Fig. 4,a transverse sectional view of the upper portionof the device, showing the clamping mechanism; Fig. 5, a similar view ofthe lowerportion of the device, showing the lower clamping mechanism;and Fig. 6,a detail sectional view showing a portion of the device,which will be hereinafter described.

The letter A indicates a rectangular base, which is slottedlongitudinally, as shown, for the reception of the clamping-bolts B,bymeans of which itis clamped to the bed of the grindstone.

0 indicates a vertical standard having a horizontal base-plate, D, whichis pivotally secured to the base A by means of a lug, E, so as to turnfreely upon said base A. The edge of the plate D is struck on the arc ofa true circle and is provided with pointers F, which travel along thesegmental graduations G, so as to provide for the accurate adjustment ofthe standard when turned to any desired position.

H indicates a clamping screw and nut for binding the standard in anydesired position. The vertical portion of the standard consists of anopen frame having vertical guides or ways I, between which is adapted toslide the rectangular rear portion of a disk, K, and the rectangularclam ping-plate L, which are held together by a screw, M, and aclamping-lever, N, which also serves to bind said parts at any desiredelevation between the guides or ways.

The disk K is provided with a rim, P, on its forward face, and withinsaid rim is secured a clamping-disk, R, which is adapted to turntherein, and to which the clampingscrew M, before mentioned, is securelyfastened. Forming part of the said disk R isatransverse sleeve, S,through which passes a rod or bar, T, of suitable length. The rod isarranged to slide freely in said sleeve, but the sleeve is provided witha set-screw or cam for binding the rod in any desired position; or thesleeve may be split and provided with lugs U, hav ing a binding-screw,W, by means of which the sleeve itself may be tightened around the rodto accomplish the same purpose.

The letter X indicates two bent arms, which are provided with sleeves Vat their rearfends and are adjustably secured by means of setscrews tothe bar T. The forward ends of these bars are provided with clamps Z, inwhich the knife is held by means of the clamping-levers A.

B indicates two chains, wires, or cords, which are secured to the bentarms, respectively, by passing their outer ends around said arms orthrough holes in the same, and fast ened by twisting or otherwise. Theinner ends of these wires or chains are secured to a crank-shaft, G,journaled in a bearing formed on thedisk K, so that by turning the crankthebar may be traversed back and forth, carrying the knife to be groundproperly over the stone.

D indicates a vertical adjusting-screw passing through the upper part ofthe standard, its lower end being swiveled between the disk K andclamping-plate L, so as to move the parts vertically and adj us t-thesame, the de- 7 Its and their adjustable parts being precisely likethose shown in Fig. 1 of the drawings, and a detailed description of thesame is deemed unnecessary.

As shown in Fig. 1, one of the bent arms near its ends is provided withlateral lugs F and a clam in -screw G b means of which small tools, suchas a chisel-blade, as shown in dotted lines, may be held to thegrindstone, which is also shown in dotted lines in said figure.

It will be seen that by my improved attachment the knives or blades maybe adjusted to any of the various angles required for grinding withoutremoving the same, thus forming a convenient and efficient device.

Between the sliding and rotating disks, and bearing them outwardnormally, is arranged a spiral spring, H, which serves to release orloosen the parts when the clamping screw is turned, so as to relieve thepositive or binding pressure upon the parts.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

1. The combination, with the base slotted for the reception of bolts bywhich it may be secured to the bed ot'thegrindstone, and graduated asdescribed, of the standard having a.

horizontal base-plate and pivotally connected to the base, the pointersadapted to actin conjunction with the graduates, and the clampingdevices adapted to hold the standard in an adjusted position,substantially as specified.

2. The combination, with the standard having vertical ways or guides, ofthe verticallymovable disk having its rear squared and fitted to slidebetween the guides or ways, and the screw and clamping-lever, wherebythe parts are held in an adjusted position.

3. The combination, with the frame, the

vertical moving disk, and clamping-plate, of the rotating disk having asleeve on its forward face and provided with a screw extending throughthe vertically-moving disk, and the clamping-lever, all arranged tooperate substantially in the manner specified.

4. The combination, with the verticallyslotted standard, the disk K,having extending laterally across its face the sleeve S, and theclamping mechanism, of the rod T, passing through said sleeve andprovided with adjustable arms to support the knife or blade,substantially as described.

5. The combination, with the bar and sup v porting-arms and the sleeved,disk, of the chains, wires, or cords secured to said arms and thecrank-shaft and its bearings, the wires being secured to said shaft,whereby the bar may be traversed back and forth over the stone,substantially as set forth.

6. The combination, with the standard, its vertical graduated ways orguides, and the vertically-sliding disk and clamping-plate, of thescrewswiveled between the same and passing through the standard, wherebythe parts are adjusted vertically, substantially as specifled.

7. The combination, with the verticallyslotted standard 0, the disk K,vertically adjustable, the rotatable disk R, provided with a sleeveextending laterally across its face, and the clamping devices, of therod T and bent arms X, provided with clamping devices, substantially asdescribed.

In testimony whereof I affix my signature in presence of witnesses.

JONATHAN R. HAMILTON.

\Vitncsses:

O. M. ALEXANDER, M. P. GALLAN, CHAS. D. DAVIS.

